<!--左边导航菜单-->
    <ul id="left-nav" class="nav nav-list sidenav">        
        <li ><a href="#student" class="nav-header" data-toggle="collapse"> 
            <i class="glyphicon glyphicon-th-large"></i> 学生管理
            <span class="pull-right glyphicon glyphicon-chevron-down"></span></a>
             <ul id="student" class="nav nav-list sidenav collapse in secondmenu" style="height: 0px;">
                <li ><a href="{:U('Index/index')}"><i class="glyphicon glyphicon-th-list"></i> 学生管理</a></li>
                <li ><a href="{:U('Index/show')}"><i class="glyphicon glyphicon-calendar"></i> 学生浏览</a>
                </li>
                <li ><a href="{:U('Index/search')}"><i class="glyphicon glyphicon-calendar"></i> 学生查询</a>
                </li>
                <li ><a href="{:U('Index/table')}"><i class="glyphicon glyphicon-calendar"></i> 表格导出</a>
                </li>
                 <li><a href=""><i class="glyphicon glyphicon-th-list"></i>班级列表</a></li>    
            </ul> 
          </li>
    </ul>

